PPC: [turbofan] Add basic support for calling to (a subset of) C functions.

src/compiler/ppc/code-generator-ppc.cc

Index: src/compiler/ppc/code-generator-ppc.cc
diff --git a/src/compiler/ppc/code-generator-ppc.cc b/src/compiler/ppc/code-generator-ppc.cc
index 63ebfc89804c32ed48341cb004cd950e00b3f733..b1fc707bca6c99b8fc02ba0323129b65670163df 100644
--- a/src/compiler/ppc/code-generator-ppc.cc
+++ b/src/compiler/ppc/code-generator-ppc.cc
@@ -657,6 +657,22 @@ void CodeGenerator::AssembleArchInstruction(Instruction* instr) {
       DCHECK_EQ(LeaveRC, i.OutputRCBit());
       break;
     }
+    case kArchPrepareCallCFunction: {
+      int const num_parameters = MiscField::decode(instr->opcode());
+      __ PrepareCallCFunction(num_parameters, kScratchReg);
+      break;
+    }
+    case kArchCallCFunction: {
+      int const num_parameters = MiscField::decode(instr->opcode());
+      if (instr->InputAt(0)->IsImmediate()) {
+        ExternalReference ref = i.InputExternalReference(0);
+        __ CallCFunction(ref, num_parameters);
+      } else {
+        Register func = i.InputRegister(0);
+        __ CallCFunction(func, num_parameters);
+      }
+      break;
+    }
     case kArchJmp:
       AssembleArchJump(i.InputRpo(0));
       DCHECK_EQ(LeaveRC, i.OutputRCBit());
@@ -962,6 +978,16 @@ void CodeGenerator::AssembleArchInstruction(Instruction* instr) {
       __ Push(i.InputRegister(0));
       DCHECK_EQ(LeaveRC, i.OutputRCBit());
       break;
+    case kPPC_PushFrame: {
+      int num_slots = i.InputInt32(1);
+      __ StorePU(i.InputRegister(0), MemOperand(sp, -num_slots * kPointerSize));
+      break;
+    }
+    case kPPC_StoreToStackSlot: {
+      int slot = i.InputInt32(1);
+      __ StoreP(i.InputRegister(0), MemOperand(sp, slot * kPointerSize));
+      break;
+    }
     case kPPC_ExtendSignWord8:
       __ extsb(i.OutputRegister(), i.InputRegister(0));
       DCHECK_EQ(LeaveRC, i.OutputRCBit());